Patent GB-728556-A (GB)
Title: Oil burner
IPC: F23D5/04
Filed: 1953-05-12
Abstract: 728,556. Liquid-fuel burners. CIGLIA, E. F. May 12, 1953, No. 13206/53. Class 75 (1). In a pot-type oil burner vaporized fuel is fed into an ignition chamber from an adjacent fuel chamber, and liquid fuel is vaporized in an openended vaporizing tube directed towards the fuel chamber and surrounded by and spaced from a further tube in heat conducting contact with the fuel chamber housing, said further tube defining a passage from the vaporizing tube to the fuel chamber. The vaporizing tube 50, Fig. 1, which may be perforated as shown or without perforations, is rotated, being connected by spiders to a coaxial shaft 39 driven by a worm gearing 28, a belt and pulley 25, and a pulley 22 carried on the shaft of a fan mounted within a casing 17 and driven by an electric motor 15. The fan supplies combustion air through a tube 42 in heat conducting contact with the burner pot 55 and coaxially surrounding and spaced from the vaporizing tube 50. Vaporized fuel is drawn into the air stream and the mixture passes into a space 150 between the burner pot 55 and an inner eccentric cylinder 65, and thence through perforations 66, Fig. 4, to be ignited within the cylinder 65, the flame passing out through an opening 86 in a ceramic top ring 85. The tube 42 is heated by conduction from the pot 55 and may also absorb heat from the surrounding space when the burner is mounted in the fire box of a furnace; and the vaporizing tube 50 is heated by radiation from the tube 42, the air flow in the space between the tubes 42, 50 ensuring that the tube 50 is not heated sufficiently to carbonize the oil. Oil is supplied through a pipe 93 to the inner surface of the vaporizing tube 50, and the supply is initiated by means responsive to a thermostat to cause oil to spread over the bottom wall 141 of the space 150 and through openings 71 in the cylinder 65 on to a plate 64 heated by an electric resistance element 69. An electric control system energizes an incandescent ignition coil 142 when the plate 64 is heated sufficiently to vaporize the oil, and de-energizes the element 69 when the vapour is ignited. The wall 141 is of relatively large mass so as to absorb sufficient heat to prevent carborization of oil thereon during the starting operation. A perforated cylindrical ceramic body 73 arranged coaxially within the cylinder 65 becomes incandescent during operation of the burner and ensures continuous combustion. Below the perforations 66 the cylinder 65 is surrounded by asbestos insulation 67 retained by a ring 68, whereby the temperature of the cylinder 65 is maintained sufficiently high to prevent condensation of oil thereon. Oil is fed at a controlled rate through the tube 93 from a reservoir 90 by means of a valve comprising a slot 105, Fig. 6, in the end of a shaft 104 slidable vertically relatively to a cylindrical outlet 106. The valve is actuated by a solenoid 89 which is energized under the control of a thermostat to cause a pivoted armature 89a to move a shaft 98 against the action of spring 99, and pivot a bell crank 96 connected to the shaft 104 to raise the latter. To ensure that the head of oil in the tank 90 does not exceed a predetermined amount a float 121 rises as the fuel enters the tank through an inlet 91, and causes a dog 133, on a lever 123 pivotally connected to the float, to disengage from a lug 134 on a lever 126, whereby the latter pivots downwardly and a plug 128 carried thereby closes the inlet 91.